单项选择题

A．Graduate students.
B．Undergraduate students.
C．Professors.
D．Library employees.
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单项选择题
From the passage we know switchgrass is______.
A．a biochemical product
B．a kind of animal
C．a kind of grass growing very fast
D．a kind of grass growing in a specific soil
单项选择题
Two different points are made in the essay about the efficient use of land, one of them is that some countries use old-fashioned methods of cultivation and therefore get a low yield, the other point is the certain kinds of food require more land than others.
A．Y
B．N
C．NG
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